1. There is no oil seal on the transmission shaft. If the front oil seal of the transmission shaft leaks oil behind the gearbox, then the front oil seal of the tail tooth leaks oil behind the transmission shaft.

2. Follow the replacement process. Once the transmission shaft is removed, if the oil seal at the rear of the gearbox leaks oil, find a straight knife and tilt it out directly. Then clean and install a new one. When installing a new oil seal, pay attention to the spring at the edge of the oil seal and cut it off by 2mm.

3. After leveling, seal the edge and oil seal, and then install the transmission shaft.